Vacuum-governor.



No. 810,109. PATENTED JAN..16, 1906. R. GONRADER.

VACUUM GOVERNOR.

APPLICATION FILED JAMES. 1905.

2 SHEETS-snarl.

No. 810,109. PATENTED JAN. 16, 1906. R. CONRADER.

VACUUM GOVERNOR. APPLICATION FILED JAILZS. 1905.

2 SHEETS-SHEET 2.

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VACUUM-GOVERNOR.

Specification of Letters Patent.

Patented Jan. 16, 1906 Application filed January 23, 1905. Serial No. 242,380.

To all whom it new concern:

Be it known that I, RUDOLPH CONRADER, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Improvements in Vacuum Governors, of which the following is a specification.

This invention relates to vacuum-governors and it consists in certain improvements in the construction thereof, as will be hereinafter fully described, and pointed out in the claims.

The object of the invention is to supply a governor or regulator for controlling the pressure in tanks, condensers, and the like wherein a pressure less than atmospheric pressure is desired. In the broadest phases of the invention it relates to a means of controlling this pressure by controlling the movement of fluid from or to the tank or condenser. The invention is, however, particularly adapted to a vacuumgovernor which is applied to a pump, the intake of which is connected with the tank or condenser for creating the partial vacuum therein. In this instance it governs or controls the pump, so as to effect suchan o eration of the pump aswill maintain a uni orm pressure in the tank or condenser. The problem presentedthat is, the controlling of pressure less than atmospheric pressure-is attended with some difliculties which do not exist where pressure above atmos heric pressure is to be controlled. In tlie first place the range or variation of pressure which may be utilized for accomplishing this result is under ordinary conditions much less. The total variation from air-pressure to the most perfect partial vacuum practical is not large. Therefore to have the governing of this pressure which forms the pressure-vacuum effective it must be done with a very small variation of pressure and with a very light pressure. In my preferred construction 1 utilize means for intensifying this variation, so as to get a more sensitive and more powerful controlling effeet. It is desirable also where this governor is used in connection with the pump that the ordinary controlling factors of a centrifugal governor be utilized, and in my preferred construction the invention is adapted or utilized in connection with a centrifugal governor. This governor is not actuated, however, tomaintain the pump at a uniform speed, but on the contrary to vary the speed of the pump to maintain a uniform pressure or partial vacuum.

The'invention is illustrated in the accompanying drawings, as follows:

Figure 1 shows a side elevation of the device, some of the parts being in section to better show construction; Fig. 2, a plan view of the device; Fig. 3, a section on the line 3 3 in Fig. 2; Fig. 4, an enlarged central section through the controlling mechanism.

A marks the valve-body; B, the governing valve. This is shown as it is ordinarily formed for governing engines of different classes and operates in the manner of throttling-valves. Arranged on the top of the valve-body is a frame A, the bottom of the frame having the plate a, which is bolted on the topof the valve-body A. The frame A has the yoke formed of the arms a and a and the bearing a which extends upwardly from the yoke. It also is provided with the bear ing a. Extending from the valve B is the stem 1). Arranged on this stem is a spool b,

and resting on this spool is the extension 6 (Shown in dotted lines in Fig. 1.) This extension has a cross-head C, to which are adapted the links C. These are pivotally connected with the weights D. The weights D are pivoted at d d on the carrier E. The carrier extends through the journal A and is hollow, allowing the extension b to pass through it. A gear F is fixed on the lower end of the carrier and meshes a gear G on the shaft H. The shaft H is journaled on the bearing a and the drive-pulley I is fixed on this shaft. The parts thus described are arranged in the manner they are ordinarily arranged in throttling-governors, practically the same construction being shown in several patents heretofore issued to me, one being that of November 14, 1899, No. 636,764.

The weights D form the centrifugal elements of the governor. Opposed to these is the centripetal element, which, as shown, is as follows: A lever J engages the spool b. This lever is journaled. in the arm a on the pin The outer end of the lever has the yoke n, through which extends a rod K. A shoulder k on this rod rests on a lever J and also forms a rest for a spring L. A sliding block 7c is threaded on the rod K, and a spring L is tensioned between this shoulder l and an adjusting-stud M. The stud M is threaded in the upper end of a yoke N and is locked in an adjusted position by the jamtial operation is the one acted upon.

nut m. The yoke is guided by the bolt n, which passes through an ear of on the arm (1?. The nut is preferably made adjustable, so as to limit the movement of the yoke, and conse-. quently prevent the entire cutting of? of steam through the valve.

The spring L is of greater strength than the spring L. Therefore the spring L in theIinit is of course more sensitive than the heavier spring, and when through the operation of the yoke, as hereinafter described, the lighter spring L is entirely compressed the governoris actuated by the spring L. On the other hand, when the yoke is so moved as to practically relieve the spring L of tension the governor operates under the action of the spring L. Of course the force of the centripetal element is varied within the range of each of the springs themselves; but it is also varied by the successive action of these springs. These springs operate in practically the same manner and with practically the same result, as is shown in the construction fully described in my former patent of December 25, 1900, No. 664,468.

The means for moving the yoke, and thus varying the force of the centripetal element, comprises the cylinder R, in which is arranged the piston Q. A stem P extends from the piston to a cross-head P. Rods O are secured to this cross-head and extend through the cross-pieces n on the bottom of the yoke. They are adjustably secured in this position by the nuts 0 0. Arms R extend from each side of the cylinder, and springs S extend from the cross-piece N to the arms R and are tensioned, so as to tend to force the cross-piece n, and consequently the yoke, downwardly, the tendency of which would be to increase the force of the centripetal element of the governor. This action, however, is opposed by the air-pressure on the outside of the piston Q, forming'the motor for controlling the centripetal element. Where the pressure on both sides of the motor is balanced, these springs of course are fully exerted on the yoke and draw it down, so as to force the spring L out of action and put the spring L under tension. When the air in the cylinder R is exhausted at one side of the motor or piston Q, the air-pressure on the outside of this piston is suflicient to overcome these springs and force an upward movement of the yoke, thus decreasing the force of the centripetal element of the governor.

Of course as the centripetal element is increased the engine will run at a greater speed before the centrifugal force of the weights will balancethe centripetal element of. the governor, and when the force of the centripetal element is diminished a lower speed on the weights will balance the centripetal element, so that by changing the force of one of these elements either the centrifugal or centripetal element, as shown, the engine or pump may be brought to any speed that will exhaust fluid from the condenser or tank in su'flicient quantities to maintain a uniform pressure therein. This relation of the centripetal and centrifugal elements is fully set forth in the patent hereinbefore referred to.

The cylinder R is connected through the passage 7' with a chamber T. Leading into this chamber is a minute opening t from the atmosphere. An exhaust-opening t leads from this chamber to a connection V. This connection is preferably in communication with a fluid which is under nearly uniform pressure and in the construction shown is in communication with any tank or condenser (not shown) from which the fluid is being pumped. The passage t is controlled by a needle-valve U. A stem U extends through a partition '0 into a cylinder V, and it is secured to a piston W. The manner of securing is not important, but as shown the piston is provided with a socket w into which a head a of the cross-head is placed and against which the nut w is screwed. The inner end of the cylinder is connected through a passage o so that this side of the piston is subjected to atmospheric pressure. The opposite side of the piston is exposed to the pres sure in the tank or condenser from which fluid is being pumped and the pressure of which is to be regulated. To accomplish this, the cylinder V is connected by the passage 1) with a connection V, so that the cylinder V is at all times in communication with the fluid' the pressure of which is to be regulated. A spring X is tensioned against the piston and is added to the light pressure forming the partial vacuum to oppose the atmospheric pressure at the opposite end of the cylinder. One end of the spring rests against the piston and the other against a shoulder y. The shoulder is arranged on a screw-threaded stem Y in the bonnet V The outer end of the stem is provided with an index-finger Y, which travels over a disk V which may be graduated so as to indicate the tension on the spring X.

The motor comprising the piston Q may for convenience be termed the regulatingmotor, and the motor comprising the piston W may for convenience be termed the controlling-motor.

If the cylinder R of the regulating-motor were merely connected with the condenser from'which fluid is being pumped, the pressure in the cylinder R would of course be the slight pressure incident to the partial vacuum in the tank or condenser, and the variation of pressure therein which would be the governing variation would be the variation of pressure in the tank or condenser. Frictionalthe pressure in the cylinder.

pumped or controlled. When the valve U is closed, air entering from the atmosphere.

through the minute opening 25 creates a pres sure in the cylinder R equal to atmospheric pressure, so that pressure on both sides of the regulating-motor is balanced and the springs S move the yoke to its lower position. This of course increases the power of the centripetal element, and consequently increases the normal speed of the pump. When the pressure of the fluid to be pumped has been diminished to the desired pressure, the pressure in the cylinder W acting against the pressure of the atmosphere upon the pistonthat is, the pressure of the spring X and the fluid to be pumpedis less than the pressure of the atmosphere, so that the atmospheric pressure acting upon the piston moves it and opens the needle-valve U. As the needlevalve U is opened air is exhausted from the chamber T, and consequently the cylinder R. The rapidity of this exhaust depends entirely upon the amount of opening of the needlevalve. If the pressure in the fluid to be pumped has been diminished to the desired minimum, then the atmospheric pressure acting on the piston is sufficient to open the needlevalve to a sufficient extent to exhaust the air from the chamber T and cylinder R so rapidly as to bring its pressure down to practically that of the fluid to be pumped. hen this happens, the atmosphere, acting against the piston Q, is suflicient to overcome the springs S as aided by the springs L and L and moves the yoke to its upper position, thus decreasing the force of the centripetal element and bringing the speed of the pump to its minimum speed. Different positions of the valve U will change the relative capacities of the openings tand t, and as these relative capacities are changed the pressure in the chamber T and cylinder R are changed and this range of variation will through this means extend in ordinary cases from atmospheric pressure to nearly a perfect vacuum and may be accomplished with a very much less change of pressure in the fluid to be pumped.

It will be noted that the springs S form counterpressure devices acting against the atmospheric pressure operating upon the motor formed. by the piston Q and acting with It will also be noted that the spring X forms a counter-pressure device for the controlling-motor which acts against the atmospheric pressure and that by means of the threaded stem Y this counter-pressure may be increased or diminished, as desired, so as to increase or diminish the movement of the piston I/V with a given variation of pressure in the fluid to be pumped. This of course controls the extent of variation, or, in other words, the intensifying effect in the cylinder R and chamber T that is, it may be made by adjusting the spring more nearly to approach the actual change of pressure or have a wide divergence from it. In each case, however, the ratio of change is practically the same.

It will be noted that in the device here described there is a variation of the strength of one of the elements, as shown the centripetal element of the governor, within the limits of power of the centrifugal element. By this means the governor finds some intermediate point wherein it can maintain the pressure and when applied to a pump will give to the pump the speed that will ust take care of the work as distinguished from the governing apparatus which throws the pump into its maximum speed and then when the pressure in the vacuum-chamber reaches the desired lower pressure brings the pump to its minimum speed.

It will also be noted that in the governors shown the centers of gravity of the centrifugal weights are arranged above the pivots of the weights, so that gravity acts very slightly upon these weights. With such an arrangement the governor may be made to run very slowly, as fully set forth in prior patents referred to. i

It will also be noted that while regulating devices on the vacuum-governor shown are applied to the regulating-valve indirectly through the action upon the centripetal element of a centripetal governor they may be so applied as to influence or control the regulating-valve Without the interposition of a centripetal governor.

What I claim as new is 1. In a vacuum-governor the combination of the centrifugal element; a centripetal element arranged to operate in opposition to said centrifugal element; and means controlled by the fluid to be pumped for acting upon one of said elements to vary the action of the governor.

2. In a vacuum-governor, the combination of the centrifugal element; a centripetal element arranged to operate in opposition to said centrifugal element; and means controlled by the fluid to be pumped for acting upon the centripetal element to vary the action of the governor.

3. In a vacuum-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; means actuated by the fluid to be pumped for varying the relative strength of one of the elements Within the limits of power exerted by the other element.

4. In a vacuumgovernor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; means actuated by the fluid to be pumped for varying the strength of the centripetal element within the limits of power exerted by the other element.

5. In a vacuum-governor, the combination of a centrifugal element; a spring-actuated centripetal element arranged to act in opposition to said centrifugal element means actuated by the fluid to be pumped for varying the strength of the spring comprised in said centripetal element.

6. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element comprising a plurality of springs, said centripetal element being ar ranged to act in opposition to said centrifugal element; and means actuated by the fluid to be pumped for throwing said springs into and out of action to vary the strength of the centripetal element 7. In avacuum pump-governor, the combination of a centrifugal element arranged to tend to move outwardly at the slowest speed at which the governor is designed to operate; a centripetal element arranged to act in opposition to said centrifugal element; means actuated by the fluid to be pumped for automatically varying the strength of one of said elements within the limits of power exerted by the other element.

8. In a vacuum pum governor, the combination of a centrifugafelement; a centripetal element arranged to operate in opposition to said centrifugal element; a pressure device having one side exposed to a constant pressure of the atmosphere and the op osite side to a pressure controlled by the luid to be pumped; a counter-pressure device actuated by the fluid to be pumped and against the constant pressure; and means communicating the action of the pressure device to one of said elements of the governor.

9. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to operate in opposition to said centrifugal element; a pressure device having one side exposed to a constant pressure of the atmosphere and the opposite side to a pressure controlled by the fluid to be pumped; a counter-pressure device actuated by the fluid to be pumped and against the constant pressure; and means communicating the action of the pressure device to the centripetal element of the governor.

10. In a vacuum limp-governor, the combination of a centri ugal element; a centripetal element arranged to operate in opposition to said centrifugal element; a pressure device having one side exposed to a constant pressure of the atmosphere and the opposite side to a pressure controlled by the fluid to be pumped; a counter-pressure device actuated by the fluid to be pumped and against the constant pressure; and means communicating the action of the pressure device to the centripetal element of the governor, to increase the strength of the centripetal element relatively to the centrifugal element when the pressure of fluid to be pumped increases and decreases the strength of the centripetal element relative to the centrifugal element when said pressure decreases.

11. In a vacuumpump-governor the combination of a centrifugal element ;,a centripetal element arranged to operate inopposition to said centrifugal element ;a pressure device having one side exposed to a constant pressure of the atmosphere and theopposite side to a pressure controlled by the fluid to be umped; a counter-pressure device actuated by the fluid to be pumped and against the constant pressure; and means communicating the action of the pressure device to one of said elements of the governor to vary the relative strength of one of said elements within the limits of power exerted by the other element.

12. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to operatein opposition to said centrifugal element; a pressure device having one side exposed to a constant pressure of the atmosphere and the opposite side to a pressure controlled by the fluid .to be pumped; a counter-pressure device actuated )y the fluid to be pumped and against the constant pressure; and means communicating the action of the pressure device to the centripetal elementof the governor to vary the relative strength of said centripetal element relatively to the centrifugal element w'thin the limits of power exerted by the centripetal element.

13. In a vacuum pump-governor, the combination of a centrifugal element a centripetal element comprising a spring arranged to operate in opposition to the centrifugal element; a yoke against which said centripetal element is tensioned; a motor comprising the cylinder It, the pressure in which isbelow atmosph eric pressure and controlled by the fluid to be pumped; the pistonQ arranged in the cylinder and exposed to the atmosphere on one side and pressure on the cylinder at the opposite side; means for communicating the action of the piston to the yoke and the counter-springs S operating against the pressure of the atmosphere on said piston.

14. In a vacuum-governor, the combina tion of a motor arranged to actuate said governor; means connecting said motor with a fluid-supply, said motor being arranged to act with a change of pressure in the rarefied fluid to be controlled; and means for intensifying the change of fluid-pressure on the mo tor over a change of pressure in the controlled fluid.

15. In a vacuum-governor, the combina tion of a motor arranged to actuate said governor; means for connecting said motor with a fluid-supply which is below atmospheric pressure, said motor being arranged to act with a change of pressure in the rarefiedpressure to be controlled; and means for intensifying the change of pressure in the motor over a change of pressure in the controlled fluid.

16. In a vacuum-governor, the combination of a motor arranged to actuate said governor; means for connecting said motor with a rarefied fluid, the pressure of which is to be controlled, said motor being arranged to act with a change of pressure in said fluid; and means for intensifying the change of fluidpressure on the motor over a change of pressure in the controlled fluid.

17. In a vacuum-governor, the combination of a motor arranged to actuate said governor; means connecting said motor with a fluid-supply, said motor being arranged to act with a change of pressure in the rarefied fluid to be controlled; means for intensifying the change of fluid-pressure on the motor over a change of pressure in the controlled fluid; and means for controlling said intensifying action to vary the pressure on the m0- tor in a fixed ratio to a change of pressure in the controlled fluid.

18. In a vacuum-governor, the combination of a motor arranged to actuate said governor, having one side exposed to a constant pressure as the atmosphere and the opposite side to fluid-pressure less than that of the atmosphere; a counter-pressure device acting against the constant pressure; means for varying said fluid-pressure as the pressure of the rarefied fluid to be controlled varies; and means for intensifying the change of said fluid-pressure over a change of pressure in the fluid to be controlled.

19. In a vacuum-governor, the combination of a motor arranged to actuate said governor, having an intake and an exhaust opening; means influenced by the fluid to be controlled for varying the capacity of one of said openings for varying the pressure on the motor.

20. In a vacuum-governor, the combination of a motor arranged to actuate said governor; means for connecting said motor with a vacuum-chamber, the fluid-supply of which is to be regulated, said motor having an intake-opening and an exhaust-opening into said connection, said motor being arranged to act as fluid is exhausted through said eX- haust-opening and connection.

21. In a vacuum-governor, the combination of a motor arranged to actuate said governor; means for connecting said motor with a vacuum-chamber, the pressure of which is to be controlled, said motor having an intakeopening and an exhaust-opening into said means of connection, and being arranged to act as the fluid is drawn through the exhaustopening and connection; and means for vary ing the relative capacities of said intake-and exhaust opening.

22. In a vacuum-governor, the combination of a motor arranged to actuate said governor; means for connecting said motor with a vacuum-chamber, the pressure of which is to be controlled, said motor having an intakeopening and an exhaust-opening into said means of connection, and being arranged to act as the fluid is drawn through the exhaust opening and connection; and means for varying the capacity of said exhaust-opening.

23. In a vacuum-governor, the combination of a motor arranged to actuate said governor; means for connecting said motor with a vacuum chamber, the pressure of which is to be controlled, said motor having an intakeopening and an exhaust-opening into said means of connection, and being arranged to act as the fluid is drawn through the exhaustopening and connection; and means for automatically varying the relative capacities of the intake and exhaust opening.

24. In a vacuum-governor, the combination of a motor arranged to actuate said governor; means for connecting said motor with a vacuum-chamber, the pressure of which is to be controlled, said motor having an intakeopening and an exhaust-opening into said means of connection, and being arranged to act as the fluid is drawn through the exhaustopening and connection; and means influenced by the rarefied fluid to be controlled for automatically varying the relative capacities of said openings.

25. In a vacuum-governor, the combination of a motor for actuating said governor; means for connecting said motor with a vacuum-chamber, the fluid-supply of which is to be controlled, said motor having an exhaustopening into said means and an an intakeopening; means for automatically varying the relative capacities of said openings with a variation of pressure in said connecting means; mechanism for controlling the extent of variation with a given variation of pressure in said connecting means; means for adjusting said mechanism to change the extent of variation in the relative capacities of the openings with a given variation of pressure in said connecting means.

26. In a vacuum-governor, the combination of a motor arranged to actuate said governor; means for connecting said motor with a vacuum-chamber, the pressure of which is to be controlled, said motor having an intake and exhaust opening leading to said connection; means for automatically varying the capacity of one of said openings with a variation of the rarefied fluid to be controlled; and means for controlling the extent of variation with a given variation of pressure in the controlled fluid.

27. In a vacuum-governor, the combination of a regulating-valve; a motor arranged to influence the regulating-valve; a counterpressure mechanism varying in strength with the movement of the motor; means for connecting said motor with a vacuum-chamber, 1

trolling-motor with a vacuum-chamber, the

ressure of which is to be controlled; means tor applying the fluid-pressure on said regulating-motor to actuate it; and means controlled by said controlling-motor for intensifying the pressure on the regulating-motor over a change of pressure in said connecting means.

29. In a vacuum-governor, the combination of a regulating-valve; a regulating-motor arranged to influence said regulatingvalve, said motor being provided with an intake-opening and an exhaust-opening a controlling-motor; means for connecting said controlling-motor with a vacuum-chamber, the pressure of which is to be regulated; and a valve actuated by the controlling-motor and arranged to vary the relative capacities of said intake and exhaust openings.

30. In a vacuum-governor, the combination of a regulating-valve; a regulating-motor arranged to influence said regulatingvalve, said motor being provided with an in take-opening and exhaust-opening; a con trolling-motor one side of which is exposed to the atmosphere and the other to the pressure of the fluid to be controlled; a counterpressure device in said controlling-motor opposing the atmospheric pressure and assisting the fluid-pressure arranged to increase in strength with the movement of said motor;

means for connecting said controlling-motor with a vacuum-chamber, the fluid-pressure of which is to be controlled; and a valve actuated by said controlling-motor and arranged to vary the capacity of one of said openin s with a movement of said motor.

31. n a vacuum-governor the combination of a regulating-valve; a regulating-motor arranged to influence said regulatingvalve, said motor being provided with an intake-opening and exhaust-opening; a controlling-motor, one side of which is exposed to the atmosphere and the other to the pressure of the fluid to be controlled; a counterpressure device in said controlling-motor opposing the atmospheric pressure and assisting the fluid pressure arranged to increase in strength with the movement of said motor; means for connecting said controlling-motor with a vacuum-chamber, the fluid pressure of which is to be controlled; and a valve actuated by said controlling-motor and arranged to vary the capacity of one of said openings with a movement of said motor; and means for adjusting the counter-pressure device to vary the movement of the controlling-motor with a given change of pressure in said connecting means.

32. In a vacuum-governor, the combination of a regulating-valve; a regulating-motor arranged to influence said regulatingvalve, said motor being provided with an intake-opening and exhaust-opening; a controlling-motor, one side of which is exposed to the atmosphere and the other to the pressure of the fluid to be controlled; a counterpressure device in said controlling-motor opposing the atmospheric pressure and assisting the fluid-pressure arranged to increase in strength with the movement of said motor; means for connecting said controlling-motor with a vacuum-chamber, the fluid-pressure of which is to be controlled; a valve actuated by said controlling-motor and arranged to var the relative capacities of said openings wit a movement of said motor and to control the exhaust passage; and means for varying the valve-action in the opening to vary the relative capacities of the openings after the exhaust-passage is open.

33. In a vacuum-governor; the combination of a regulatingvalve; a regulating-motor arranged to influence said regulatingvalve said motor being provided with an intakeopening and an exhaustopening; a controlling-motor; means for connecting said controlling-motor with a vacuum-chamber, the fluid-pressure of which is to be controlled; and a needle-valve actuated by said controlling-motor and arranged in'one of said open- 34. In a vacuum-governor, the combination of a regulating-motor arranged to actuate the governor said regulatingmotor comprising the cylinder R piston Q in said cylinder, said pistonbeing exposed on one side to the atmosphere and the other side within the cylinder; a counterpressure device acting against the atmosphere; a connection with the cylinder R having the intake 2, and exhaust-passage t; the needle-valve U controlling the exhaust-passage t and the controlling-motoncomprising the cylinder V, piston W in said cylinder, the spring X arranged against the piston W, one side of the piston being exposed to the atmosphere and a connection V in communication with the exhaust-passage t and cylinder V at the opposite side of the piston from its exposure to the atmosphere.

35. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a motor actuated IIO by the fluid for varying the relative strength of one of said elements; means influenced by the rarefied fluid to be controlled for varying the pressure on said motor as the pressure of the fluid to be controlled varies, and for intensifying the change of fluid-pressure on the motor over a change of pressure in the controlled fluid.

36. In a vacuum pump-governor, the combination of a centrifugal element and a centripetal element arranged to operate in opposition to said centrifugal element; a motor actuated by a fluid for varying the relative strength of one of said elements; means for connecting said motor with a vacuum-chamber, said motor being arranged to act with a change of pressure in a vacuumchamber; and means for intensifying the change of pressure on the motor over the change of pres sure in the chamber.

37. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a motor actuated by a fluid for varying the relative strength of one of the elements relative to the other; means for connecting said motor with a vacuum-chamber, the fluid-supply of which is to be regulated said motor being arranged to act with a change of pressure in the chamber; and means for intensifying the change of fluidpressure'on the motor over a change of pressure in the chamber.

38. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element acting in opposition to said centrifugal element; a motor actuated by fluid Q for varying the strength of one of said elements relatively to the other; means for connecting said motor with a fluid-supply, said motor being arranged to act with a change of pressure in a vacuum-chamber; and means for intensifying the change of fluid-pressure on the motor over a change of pressure in the chamber; and means for controlling the extent of said intensifying action.

39. In a vacuum pump-governor, the combination of a centrifugal element and a centripetal element arranged to act in opposition to said centrifugal element; a motor influenced by the fluid to be controlled for varying the strength of the centripetal element; means for connecting said motor with a vacuum-chamber, said motor being arranged to act with a change of pressure in said means of connection, the fluid-pressure of which is to be controlled; and means for intensifying the change of fluid-pressure on the motor over a change of pressure in said means of connection.

40. In a vacuum ump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a fluid-actuated motor for varying the strength of one of the elements within the limits of power exerted by the other element; means for connecting said motor with a fluid-supply, said motor being arranged to act with a change of pres sure in a vacuum-chamber; and means for intensifying the change of fluid-pressure on the motor over a change of pressure in the chamber.

41. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a motor for varying the relative strength of said elements, said motor having an intake-passage and an exhaust-passage; means for varying the relative capacities of said openings; and mechanism controlled by the fluid-pressure less than atmospheric pressure for actuating said means.

42. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a motor for varying the relative strength of said elements; means for connecting said motor with a vacuumchamber, the fluid-supply of which is to be regulated, said motor having an intake-opening and an exhaust-opening leading to said connection.

43. In a vacuum pump-governor, the-combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a motor arranged to vary the strength of the centripetal ele ment; means for connecting said motor with a fluid-supply, said motor having an intake opening and an exhaust-opening; means controlled by fluid-pressure less than atmospheric pressure for varying the capacities'o'f said openings.

44. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a motor arranged to vary thestrength of the centripetal element; means for connecting said motor with a vacuum-chamb er, the fluid-supply of which is to be regulated, said motor having an intake and exhaust opening to said means of connection. 7

45. In a vacuum pum -governor, the combination of a centrifuga element; a centripetal element, comprising a plurality of springs, said centripetal element being arranged to act in opposition to said centrifugal element; a motor for throwing said springs into and out of action to vary the strength of the centripetal element; means for connecting said motor with a fluid-supply, said motor having an intake and an exhaust opening; mechanism for varying the relative capacities of said openings; and devices controlled by pressure less than atmospheric pressure for influencing said mechanism.

46. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a motor for varying the relative strength of said elements; a counter-pressure mechanism varying in strength with a movement of the motor, said motor having an intake and an exhaust passage; and devices controlled by pressure less than atmospheric pressure for varying the capacities of said openings.

47. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a motor for varying the relative strength of said elements, said motor being provided with an intake-opening and an exhaust-opening; a controlling-motor; means for connecting said controllingmotor with a vacuum-chamber, the pressure of which is to be controlled; and a valve actuated by the controlling-motor and arranged to vary the relative capacities of said supply and vent openings.

48. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to the centrifugal element; a regulating-motor arranged to regulate the varying strength of said elements, said motor being provided with an intake and exhaust opening; a controllingmotor; a counter-pressure device on said controlling-motor arranged to increase in strength with a movement of said motor; means for connecting said controlling-motor, the pressure of which is to be controlled; a valve arranged to vary the capacity of one of said openings with a movement of said motor.

49. In a vacuum pump-governor, the combinationof a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element; a regulating-motor arranged to vary the relative strength of said elements; a controllingmotor; a counterpressure device on said controlling-motor ar ranged to increase in strength with a movement of said controlling-motor; means for connecting said controlling-motor with a vacuum-chamber, the fluid-supply of which is to be regulated; a valve actuated by said controlling-motor and arranged to vary the capacity of one of said openings with a movement of said motor; and means for adjusting the counter-pressure device to vary the movement of the controlling-motor with a given change of pressure in the means of connection.

50. In a vacuum pump-governor, the combination of a centrifugal element; a centripetal element arranged to act in opposition to said centrifugal element, said centripetal ele ment comprising a plurality of. springs; a regulating-motor arranged to actuate said centripetal element and to throw said springs into and out of action to vary the strength of the centripetal element relatively to the centrifugal element, said motor being subjected to atmospheric pressure on one side and the opposite side to a pressure less than atmospheric pressure; a counter-pressure device acting against the atmospheric pressure on said motor, said motor having an intake and exhaust opening; means of connection between said exhaust-opening and a vacuumchamber, the fluid-supply of which is to be regulated; a controlling-motor having one side exposed. to the atmosphere and the other to the fluid-pressure of the means of connection; a connection between said controllingmotor and said means of connection; and a counter-pressure device acting against the atmosphere acting on said controlling-motor a screw adjustment for said counter-pressure device; an indicating-finger on said screw; and a dial in the path of said finger.

In testimony whereof I have hereunto: set my hand in the presence of two subscribing witnesses.

RUDOLPH CONRADER. Witnesses:

C. D. HIGBY,

M. C. SULLIVAN. 

